Efficient lithium-metal battery based on a graphene oxide-modified heat-resistant gel polymer electrolyte with superior cycling stability and excellent rate capability

Lithium-metal batteries have revived increasing attention and research on account of the growing demands for high-energy electrical energy storage, but their unsatisfactory cycling stability and service safety have greatly limited their rapid development. In this study, a heat-resistant gel polymer...

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Bibliographic Details
Published in:Sustainable energy & fuels 2022-01, Vol.6 (2), p.386-397
Main Authors: Wang, Xiaoxiao, Zhao, Huijuan, Deng, Nanping, Li, Yanan, Yu, Ruru, Wen, Yajie, Kang, Weimin, Cheng, Bowen
Format: Article
Language:English
Subjects:
Absorptivity
Batteries
Cycles
Electrolytes
Energy storage
Graphene
Heat resistance
Lithium
Lithium-ion batteries
Mechanical properties
Nanofibers
Polymers
Rechargeable batteries
Security
Separators
Stability
Superstructures
Thermal resistance
Vinylidene
Wettability
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Summary:Lithium-metal batteries have revived increasing attention and research on account of the growing demands for high-energy electrical energy storage, but their unsatisfactory cycling stability and service safety have greatly limited their rapid development. In this study, a heat-resistant gel polymer electrolyte (GPE) based on a poly(vinylidene fluoridehexafluoropropylene) (PVDF-HFP)/poly- m -phenyleneisoph-thalamide (PMIA) nanofiber membrane doped with graphene oxide (GO) nanosheets was fabricated via a one-step electrospinning method. Significantly, the as-prepared heat-resistant gel PMIA separator with the assistance of GO sheets was endowed with a relatively low fiber diameter and large specific surface area, bringing about a markedly enhanced liquid electrolyte wettability and absorptivity so as to improve lithium-ions conduction and interfacial compatibility. Meanwhile, the obtained heat-resistant GO-modified GPE exhibited excellent heat resistance and strengthened mechanical strength, which in turn set a solid foundation for ensuring high security. Consequently, an assembled lithium-metal cell using the heat-resistant gel PMIA separator delivered a noticeable improvement in cycling stability with a capacity retention rate of 84.7% (0.077% capacity fading per cycle) after 200 cycles at 0.5C, accompanied by excellent rate performance with a high capacity recovery efficiency of 97.9%. This work shares a convenient strategy for the synthesis of a dual-functional and stable superstructure separator for advanced Li-ion batteries. Fabrication of a PMIA fiber separator for lithium-ion batteries.
ISSN:2398-4902
2398-4902
DOI:10.1039/d1se01277k